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Related Experiment Videos

Into deepest lung with drug and camera.

T K Akers1, D J Crittenden

  • 1Department of Physiology, UNDSM, Grand Forks, ND 58202.

Neuroscience and Biobehavioral Reviews
|January 1, 1988
PubMed
Summary

High oxygen levels damage guinea pig lungs, causing cell buildup and death. Catecholamine inhibitors like reserpine protected lungs from oxygen toxicity, implicating the sympathetic nervous system.

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Area of Science:

  • Pulmonary Medicine
  • Toxicology
  • Cell Biology

Background:

  • High partial pressures of oxygen (pO2) can induce pulmonary toxicity.
  • The sympathetic nervous system's role in oxygen toxicity is not fully understood.

Purpose of the Study:

  • To investigate the ultrastructural changes in guinea pig alveoli exposed to high pO2.
  • To evaluate the protective effects of catecholamine inhibitors against oxygen-induced lung injury.

Main Methods:

  • Guinea pigs were exposed to high pO2 (500 mmHg) for 6 days.
  • Scanning electron microscopy was used to examine alveolar ultrastructure.
  • Animals were pretreated with reserpine or phenoxybenzamine.

Main Results:

  • High pO2 exposure caused alveolar type II cell and macrophage engorgement, leading to significant mortality in untreated guinea pigs.
  • Reserpine pretreatment effectively prevented these damaging ultrastructural changes.
  • Phenoxybenzamine offered partial protection, but was less effective than reserpine.

Conclusions:

  • The sympathetic nervous system plays a role in the pulmonary pathology associated with oxygen toxicity.
  • Catecholamine inhibition, particularly with reserpine, can mitigate oxygen-induced lung injury.

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